Smoke-preventing furnace-door check



J. P. DOYLE. SMOKE PREVENTING FURNACE DOOR CHECK.

' APPLICATION FILED JAN. 17. 1917.

Patented July 20, 1920.

PATENT OFFICE.

JOSEPH P. DOYLE, OF LAKEWOOD, OHIO.

SMOKE-PREVENTING FURNACE-DOOR CHECK.

To all whom it may concern:

Be it known that I, JOSEPH P. DOYLE, a citizen of the United States, residing at Lakewood, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Smoke-Preventing Furnace-Door Checks, of which the following is a full, clear, and exact description.

The object of this invention is to provide a smoke preventing attachment for a furnace, which will act automatically to promote the practically complete consumption of the fuel, particularly when fresh fuel is put into said furnace, whereby the formation of smoke will be prevented.

Cheapness of construction, and efiiciency in operation to produce the desired results, are the objects sought and attained by the present invention, which is shown in the accompanying drawing and hereinafter described and definitely pointed out in the appended claim.

In the drawing Figure 1 is a front elevation of the invention'applied to a furnace, Fig. 2 is a vertical section of the dash pot shown in Fig. 1; and Fig. 3 is a sectional view in the plane of line 33 on Fig. 1.

Referring to the parts by reference characters, 10 represents a furnace, and 12 the door which covers an opening through which fuel is fed to the furnace. This door has ears 13 which are hinged to ears 11 on the furnace front by means of a rotatable shaft 14 having at its upper end a bevel gear 15. An arm 16 is fixed to this shaft and extends in front of the d0or,'its end being in contact with and preferably fixed to the door whereby when the door is opened the shaft must be turned; and when the shaft is turned in the contrary direction the door must be closed.

A steam pipe 20 is extended across the front wall of the furnace above this door, and it has a plurality of branches 21 which project through the furnace wall and into the furnace, each branch having on its inner end a nozzle 22 which discharges a stream of steam; and these nozzles are so disposed that they direct this stream at an angle downward toward the fuel bed.

At a convenient point, as in the vertical leg 24 of the steam pipe 20, a valve 25 is placed said valve having an operating arm 26.

The mechanism associated with this valve and the furnace door is all mounted upon Specification of Letters Patent.

Patented July 20, 1920.

Application filed January 17, 1917. Serial No. 142,788.

and supported by a plate 30 which furnishes a convenient means for attaching said mechanism to any furnace. A vertical dash pot 40' is fixed to this plate; said dash pot being closed at both ends. In it is a piston 41 which is fixed to the piston rod 42 that passes out of the dash pot at both ends thereof. A by-pass 45 is connected with the dash pot near opposite ends thereof and said by-pass contains a valve 46 by which to regulate the rate of flow of oil, which the dash pot is to contain, from the lower part of the dash pot below the piston into the upper part of the dash pot above the piston.

This piston 41 is constructed substantially like the. piston which is shown and described in my prior Patent No. 998,962, that is to say, it has a central opening to which a valve 43 is fitted. This valve is slidable upon the piston rod and is yieldingly moved upward to its seat by a spring 44 which permits the valve to open when the piston is being moved up in the dash pot, and therefore allows the contained oil to flow freely from the upper to the lower side of the piston.

The horizontal shaft 31 is rotatably mounted on plate 30, and it has a bevel gear 32 which meshes with the bevel gear 15. An arm 33 is fixed to this shaft 31.

A lever 35 is pivoted to said plate 30, and one end of this lever is connected by a link 34 with the arm 33. The other arm of said lever is connected by a link 36 with the upper end of the piston rod 42, and it is also connected by another link 37 with the valve operating arm 26. I

A weight 48 is hung on the projecting lower end of the piston rod 42,which weight must be large enough to cause the operation of the above mentioned parts in the manner now to be described to effect the closing of the furnace door and the closing of the valve 25.

When the attendant is required to put in fresh fuel he opens the furnace door. In so doing he causes shaft 14 and shaft 31 to turn, with the result that, through the described train of mechanism the dash pot piston is lifted to the top of the dash pot and the valve 25 is opened. He now puts in his fuel; and then leaves the furnace with the door wide open. Thereupon the weight 46 acts to draw down piston rod 42, which, through the described train of mechanism will cause the furnace door to be shut and the valve 25 to be closed. By adjusting valve 48 one may so vary the rate at which the oil may flow through the by-pass 45 from the lower to the upper end of the dash pot that the closing of the furnace door and the valve 25 may occupy any desired time which experience has shown to be necessary with that particular furnace to cause the practically complete con-' sumption of the smoke given off by the fresh 7 fuel. Generally speaking, this desired result will be attained if about two minutes is consumed inclosing the furnace door.

Having described my invention, I claim The combination with a furnace having a door, a vertical door pintle to which the door is rfixed, a bevel gear fixed to said door pintle,

' a steam pipe arranged to discharge steam into the furnace, anda valve for said steam pipe, of a plate detachably secured to the the same arm-of the rocking lever with the signature. 1

V valve in the steam pipe.

In testimony whereof I hereunto afiin my JOSEPH P. DOYLE. 

